10312109981 has 2 divisors, whose sum is σ = 10312109982. Its totient is φ = 10312109980.

The previous prime is 10312109959. The next prime is 10312109993. The reversal of 10312109981 is 18990121301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8536836025 + 1775273956 = 92395^2 + 42134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10312109981 is a prime.

It is a super-2 number, since 2×10312109981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10312109911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5156054990 + 5156054991.

It is an arithmetic number, because the mean of its divisors is an integer number (5156054991).

Almost surely, 2^10312109981 is an apocalyptic number.

It is an amenable number.

10312109981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10312109981 is an equidigital number, since it uses as much as digits as its factorization.

10312109981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 35.

The spelling of 10312109981 in words is "ten billion, three hundred twelve million, one hundred nine thousand, nine hundred eighty-one".